MUREX. ROCK-SHELL. 93 



much contracted at the canal, which is short; the outer-lip 

 thickened by a rib, with the margin thin : length about a 

 quarter of an inch ; breadth hardly an eighth. 

 Western coasts, and Dublin bay, on Fuci. v. v. 



13. Murex proximus. Proximate Rock-shell. 

 Montagu, pi. 30. f. 8, 



Shell thick, white, moderately pointed : spires six, ra- 

 ther abrupt at the tops, rounded and well defined, with 

 about eleven strong ribs, not striate transversely : aperture 

 oval-oblong; the canal short and rather spreading at tlie 

 end ; outer-lip extremely broad and reflected : length 

 nearly half an inch. 



Near D unbar : very rare. 



14. Murex Turricula. Turret Rock-shell 

 Montagu, pi. 9. f. 1 Dorset Cat. pi. 14. f. 15. 

 Murex angulatus. Donovan, pi. 156. 



Shell tapering to a veryfine point, clear white, yellowish, 

 or with a rosy t jnge, and rather glossy : spires eight or 

 nine, with numerous longitudinal ribs, crossed by very fine 

 transverse striae; the volutions strongly defined, and flat- 

 tened at their junctures on the top, giving them a remark- 

 ably turreted appearance : aperture oblong, ending in a 

 broad canal : the outer-lip a little angular on the upper 

 part : pillar-lip smooth : length three quarters of an inch $ 

 breadth a quarter. 



Western coasts, and Dublin bay. v. v. 



15. Murex rufus. Rufous Rock-shell, 

 Montagu, pi. 263. 



Shell oblong, taper, rufous-brown or cheanut : spires six 

 or seven, with about twelve longitudinal ribs, prominent in 

 the middle, and very faintly striate across : aperture ob- 

 long, narrow, ending in a short canal ; the outer-lip thick- 

 ened by a rib ; inner-lip smooth, much turned back, and 

 forming a very small indenture at the end of the canal : 

 length three tenths of an inch ; breadth an eighth. 



In old shells the transverse striae are obliterated, so as to 

 jnake the interstices of the ribs appear quite smooth. 



Western coast?, and Dublin bay. v. m* 



J6, 



